Chap: 1 Interactions of Living Things
Sec 1 Everything is connected
Sec 2 Living things need energy
Sec 3 Types of interactions
Chap: 2 Cycle in Nature
Sec 1 The cycle of matter
Sec 2 Ecological succession
Chap: 3 The Earth´s Ecosystems
Sec 1 Land biomes
Sec 2 Marine Ecosystem
Sec 3 Freshwater ecosystems
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